Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.35	$ 0.31	$ 0.27